CVE-2017-13720

Severity Score

7.1

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In the PatternMatch function in fontfile/fontdir.c in libXfont through 1.5.2 and 2.x before 2.0.2, an attacker with access to an X connection can cause a buffer over-read during pattern matching of fonts, leading to information disclosure or a crash (denial of service). This occurs because '\0' characters are incorrectly skipped in situations involving ? characters.

En la función PatternMatch en fontfile/fontdir.c en libXfont, en versiones hasta la 1.5.2 y versiones 2.x hasta la 2.0.2, un atacante con acceso a una conexión X puede provocar una sobrelectura de búfer durante una comparación de patrones de fuentes, lo que da lugar a una revelación de información o cierre inesperado (denegación de servicio). Esto ocurre porque se omiten de manera incorrecta los caracteres "\0" en situaciones en las que existen caracteres ?.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2017-08-28 CVE Reserved
2017-10-10 CVE Published
2023-03-08 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-125: Out-of-bounds Read

CAPEC

References (6)

URL	Tag	Source
https://bugzilla.redhat.com/show_bug.cgi?id=1500690	Issue Tracking
https://bugzilla.suse.com/show_bug.cgi?id=1054285	Issue Tracking

URL	Date	SRC

URL	Date	SRC
https://cgit.freedesktop.org/xorg/lib/libXfont/commit/?id=d1e670a4a8704b8708e493ab6155589bcd570608	2017-11-13

URL	Date	SRC
http://www.debian.org/security/2017/dsa-3995	2017-11-13
https://security.gentoo.org/glsa/201711-08	2017-11-13
https://www.x.org/releases/individual/lib/libXfont2-2.0.2.tar.bz2	2017-11-13

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
X.org Search vendor "X.org"		Libxfont Search vendor "X.org" for product "Libxfont"				<= 1.5.2 Search vendor "X.org" for product "Libxfont" and version " <= 1.5.2"		-		Affected
X.org Search vendor "X.org"		Libxfont Search vendor "X.org" for product "Libxfont"				2.0.0 Search vendor "X.org" for product "Libxfont" and version "2.0.0"		-		Affected
X.org Search vendor "X.org"		Libxfont Search vendor "X.org" for product "Libxfont"				2.0.1 Search vendor "X.org" for product "Libxfont" and version "2.0.1"		-		Affected